Abstract
RECENTLY, data were presented (Hall, 1944) suggesting that consistent assay results, within the limits of error desired, were not obtained when prolactin preparations were compared with the international standard using the systemic crop-sac weight method and groups of 10 to 12 pigeons. Bates and Riddle (1941) had a similar experience with this assay method in comparing their preparation No.657 with the Standard. This completely objective method was the best available, and improvements in the manner of comparing prolactin preparations by it have been suggested (Hall, 1944). In the hope of 4 obtaining more accuracy in prolactin assay, the ‘micro’ methods originating with Lyons and Page (1935), have also been investigated. The present work adds nothing to the original ideas on which the method was based. The inherent possibilities in this unique method have, perhaps, been more fully explored.
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